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New Products
TTurther information concerning the material described below can JL be obtained by writing direct to the manufacturers. As in the case of technical papers, publication of these news items does not constitute endorsement of the manufacturer's statements nor of his products.
one and one-half per cent at the full rated output. Microswitches automatically provide full protection against high-voltage hazards.
The voltage driver unit is identical to that used in all Westrex highpowered amplifiers and may be completely replaced, in the event of failure, simply by the use of a screw driver. Only one electrolytic capacitor is used in amplification, that being of the plugin type. All resistors, except those in the power stages, are of a precision type with a maximum permissible tolerance of one per cent.
Mounted in an attractive floor-type cabinet, this 100-watt system permits maximum flexibility in the arrangement of components to meet individual theater requirements. Full-length double doors at the rear provide easy access, while spare tubes and plug-in capacitors are stored within the cabinet in easy reach.
New Theater Amplifier System
Westrex also announces a new line of theater amplifier systems which provides standard relay-rack panels in a floor-mounted cabinet for all but the smallest system. As an aid to servicing the deep amplifier chassis a door switch automatically turns on a light inside the chassis when the front mat is removed. A standard voltage amplifier, which may be mounted 011 a 15-, 40-, 50-, or 100-watt amplifier chassis, is connected by means of small metal straps so that it may be disconnected 318
and replaced with only a screw driver. Normal space currents are indicated at 11 points in the system by means of a "100 per cent" meter.
Another feature is a small plug-in phototube amplifier, as shown in the photograph. Change-over between
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machines is effected by interlocking relays operated by a push button which may be placed at any convenient location. When stand-by amplifiers are provided, they may be put in use by means of a single switch which simultaneously cuts over amplifiers, rectifiers, and horns. Accessories such as mixing panels and nonsynchronous reproducer amplifier-equalizers are also available.